Non-linear sigma model approach to quantum spin chains
Sumathi Rao
Abstract
We introduce and motivate the study of quantum spin chains on a one-dimensional lattice. We classify the varieties of methods that have been used to study these models into three categories, - a) exact methods to study specific models b) field theories to describe fluctuations about the classical ordered phases and c) numerical methods. We then discuss the J1-J2-δ model in some detail and end with a few comments on open problems.
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